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/*-
* SPDX-License-Identifier: AGPL-3.0-only
* SPDX-FileCopyrightText: Copyright (c) 2025 Runxi Yu <https://runxiyu.org>
*/
#include <err.h>
#include <errno.h>
#include <git2.h>
#include <pthread.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/un.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "bare.h"
typedef struct {
int fd;
} conn_io_t;
static bare_error
conn_read(void *buffer, void *dst, uint64_t sz)
{
conn_io_t *io = buffer;
ssize_t rsz = read(io->fd, dst, sz);
return (rsz == (ssize_t)sz) ? BARE_ERROR_NONE : BARE_ERROR_READ_FAILED;
}
void *
session(void *_conn)
{
int conn = *(int *)_conn;
free((int *)_conn);
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
int ret = 0;
#pragma GCC diagnostic pop
int err;
git_repository *repo = NULL;
char path[4096];
conn_io_t io = {.fd = conn};
struct bare_reader reader = {
.buffer = &io,
.read = conn_read,
};
err = bare_get_data(&reader, (uint8_t *)path, sizeof(path) - 1);
if (err != BARE_ERROR_NONE) {
ret = 10;
goto close;
}
path[sizeof(path) - 1] = '\0';
err = git_repository_open_ext(&repo, path, GIT_REPOSITORY_OPEN_NO_SEARCH | GIT_REPOSITORY_OPEN_BARE | GIT_REPOSITORY_OPEN_NO_DOTGIT, NULL);
if (err != 0) {
ret = 1;
goto close;
}
git_object *obj = NULL;
err = git_revparse_single(&obj, repo, "HEAD^{tree}");
if (err != 0) {
ret = 2;
goto free_repo;
}
git_tree *tree = (git_tree *) obj;
git_tree_entry *entry = NULL;
err = git_tree_entry_bypath(&entry, tree, "README.md");
if (err != 0) {
ret = 3;
goto free_tree;
}
git_otype objtype = git_tree_entry_type(entry);
if (objtype != GIT_OBJECT_BLOB) {
ret = 4;
goto free_tree_entry;
}
git_object *obj2 = NULL;
err = git_tree_entry_to_object(&obj2, repo, entry);
if (err != 0) {
ret = 5;
goto free_tree_entry;
}
git_blob *blob = (git_blob *) obj2;
const void *content = git_blob_rawcontent(blob);
if (content == NULL) {
ret = 6;
goto free_blob;
}
write(conn, content, git_blob_rawsize(blob));
free_blob:
git_blob_free(blob);
free_tree_entry:
git_tree_entry_free(entry);
free_tree:
git_tree_free(tree);
free_repo:
git_repository_free(repo);
close:
// TODO: Implement proper error handling
dprintf(conn, "%d\n", ret);
close(conn);
return NULL;
}
int
main(int argc, char **argv)
{
if (argc != 2) {
errx(1, "provide one argument: the socket path");
}
git_libgit2_init();
int sock;
if ((sock = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0)) < 0)
err(1, "socket");
struct sockaddr_un addr;
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, argv[1]);
umask(0077);
if (bind(sock, (struct sockaddr *)&addr, sizeof(struct sockaddr_un))) {
if (errno == EADDRINUSE) {
unlink(argv[1]);
if (bind(sock, (struct sockaddr *)&addr, sizeof(struct sockaddr_un)))
err(1, "bind");
} else {
err(1, "bind");
}
}
listen(sock, 0);
for (;;) {
int *conn = malloc(sizeof(int));
if (conn == NULL)
err(1, "malloc");
*conn = accept(sock, 0, 0);
if (*conn == -1)
err(1, "accept");
pthread_t thread;
pthread_create(&thread, NULL, session, (void *)conn);
}
close(sock);
git_libgit2_shutdown();
}
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